Medfusion 3500 syringe infusion pump screw size
M4 · 12 mm long
Medfusion 3500 syringe infusion pump takes M4 metric screws, 12 mm long.
The record covers button head screws for plunger case assembly, PN G6000085 (x2).
Head and drive, as the source states them: button head.
This entry is marked confirmed and comes from infusionpumps.prescottsmed.com.
An M4 screw is 4 mm in diameter with a 0.7 mm pitch, tapped with a 3.3 mm drill; imperial look-alike: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same.
Medfusion 3500 syringe infusion pump screw specifications
One row per fitment record. Head, drive are shown only where the source states them; pitch is the ISO coarse pitch for the thread.
| Thread | Length | Pitch | Head | Drive | Where it goes | Status |
|---|---|---|---|---|---|---|
| M4 | 12 mm | 0.7 mm | Button head | not stated | button head screws for plunger case assembly, PN G6000085 (x2) | Confirmed |
Fitment records and sources
button head screws for plunger case assembly, PN G6000085 (x2)
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
How to check the screw before you buy
- Keep material and finish the same as the original (often stainless) on equipment that is cleaned or sterilised.
- Diameter: across the threads an M4 screw measures about 4 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.7 mm from one thread crest to the next (14.29 crests per centimetre). A thread pitch gauge or the pitch-gauge tool settles it in seconds.
- Length: for button head screws, measure from under the head to the tip (countersunk heads are the exception: they are measured overall).
- The record states 12 mm. Going longer risks bottoming out or touching parts behind the hole; going shorter loses thread engagement.
- Driver: the source does not name the drive. Standard M4 heads take PH2 for Phillips and T20 for Torx, and a 3 mm hex key for socket heads; a bit that fits loosely will cam out and strip the head.
- Tightening: no device-specific torque is published in these records. The site's general figure for M4 is about 2.0-3.0 N·m into metal threads and 0.8-1.4 N·m into plastic bosses; snug it up and stop.
Common mix-ups with M4
- US-made pinball machines (Williams/Bally/Stern) overwhelmingly use imperial UTS threads (#6-32, #8-32, #10-32); explicit metric threads only appear on newer/import components such as Jersey Jack Pinball's Hobbit Smaug assembly (M3).
- M4 and 6-32 UNC share a nominal diameter with different pitch — a classic cross-thread in US-market kits.
Buy these screws at TechSpare Warehouse
In stock and shipped from South Carolina. Our black screws are Phillips wafer head (low profile); match the head style and length to the original before you order.
More in Medical & Laboratory
The same screw also fits
Devices whose records share a thread with Medfusion 3500 syringe infusion pump, closest length match first.
- Prosthetic pyramid adapter also M4 × 12 mm
- Kendro / Sorvall Legend T and Multifuge 3S/3L centrifuge also M4 × 12 mm
- TSC MH241 industrial label printer also M4 × 12 mm
- Amico patient monitor 5-inch shelf with VESA plate also M4 × 12 mm
- LG 32LW5700 also M4 × 12 mm
- HP Color LaserJet 8500 2000-sheet input unit also M4 × 12 mm
- Washer / dryer top panel also M4 × 12 mm
- NovAtel SMART7 GNSS smart antenna also M4 × 12 mm
Questions about Medfusion 3500 syringe infusion pump screws
- What size screw does Medfusion 3500 syringe infusion pump use?
- M4 × 12 mm for button head screws for plunger case assembly, PN G6000085 (x2).
- How long are the screws in Medfusion 3500 syringe infusion pump?
- The record gives 12 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.
- What is the thread pitch of an M4 screw?
- 0.7 mm (coarse), which is the standard pitch for M4 machine screws; a 0.5 mm fine pitch exists but is uncommon. The tap drill is 3.3 mm and the normal clearance hole is 4.5 mm.
- What screwdriver do I need for Medfusion 3500 syringe infusion pump?
- The sources do not name the drive. For M4, Phillips heads normally take PH2 and Torx heads T20; socket heads take a 3 mm hex key.
- Can I use an imperial screw instead of M4?
- No. Imperial look-alike: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same. Use a true M4 screw so it does not cross-thread or strip the hole.